Cushion-support for pivot-joints.



F.0HENEY. -CUSH|0N SUPPORT FOR Plvo JOINTS. 4 @Prucnmu man ssrlzz, 1913. v 1,228,406. Patented june 5,1m

2 SHEETS-SHEET F CHENEY. cusHloN SUPPORT PoR Plvo Joms.

'FPLIEATION FILED SEPT. 22. 1913.

1,228,406. Patented June 5, 1917,

2 SHEETS-SHEET 2.

VW '7L/765565,'

. citizen ot the United States,

CHENEY TALKING MACHINE COMPANY, or CHICAGO; ILLINOIS,

OF ILLINOIS.

CUSHION -SUPPORT FOR PIVOT-JOIN TS.

Speccation of 'Letters Patent.

Patented J une 5, 1917.

Application led September 22, 1913. Serial No. 791,239.

To all whom t mail concern Be it known that I, FOREST CHENEY, a residing at Chicago, in the county of Cook and State of Illinois, have invented vcertain new and useful Improvements in Cushion-Supports for Pivot-Joints, of which the following is a specilication.

The principal object of my invention is to provide anew and improved pivotal support lfor the needle or stylus of a gramophone reproducer. y

Another object of my invention is to provide a gramophone reproducer with meansl for mounting and supporting the needle so as to improve the quality 0I the tone and eliminate certain objectionable tone components that occur in connection with the ordinary needle mounting.

All these objects and others will be made apparent in the following specication and claim taken with the accompanying drawings, in which I have illustrated a few embodiments of my invention. It will be understood that the invention is deined in the appended claim.

Referring to the drawings Figure l is an elevation of a gramophone reproducer.

Fig. 2 is a vertical section of the same on the line 2-2 of Fig. 1. v

Fig. 3 is a perspective view of the needlecarrying lever.

Figs. 4, 5,6 and 7 illustrate modifications in the pivot members for this lever.

Fig. 8 is a perspective view of the lever as employed in the modilication of Fig. 7.

Figs. 9, 10, l1 and 12 illustrate further modications of the pivot members. y

Fig. 13 is a perspective view of a bearing washer for the pivot of Fig. 12, and

Fig. 14 is a perspective view of the lever of Fig. 12.

Referring to Figs. 1. 2 and 3, the reproducer chamber wall 20 has an opening 21 through which the sound waves are delivered from the diaphragm.l This diaphragm 22 is clamped between the rubber rings 23 and 24, the ring 23 lying in the annular channel 25. These parts are thus secured in proper relation by the annular plate 26 fastened by the screws27.

The lever 28 of the form shown in Figs. 2 and 3 has its upper end attached to the center of the diaphragm 22; below it is expandplate 37 and into a socket in the ed into a block 29 carrying a crossbar l32 with a pair of projecting pivot points 33. The block 29 has a. hole therethrough in which is mounted the needle .or stylus 30 clamped by the screw 31. v

A pair of lugs 34 and 35 depend from the chamber wall 20. Adjacent to the cross bar 32 and pivot points 33 is a cushion 36 of soft rubber or other suitable material. Adjacent to the cushion 36 is a metal clamping plate 3T engaged by the shoulder on the screw 38 which passes through the lug 34. The screw 38 has a reduced extension 39 beyond the shoulder which passes through a hole in the cushion 36; this projection 39 is designed to support the cushion 36 so that it will'not drop down.

The depending lug 35v has conical pits or sockets designed to receive the pivot points 33. A plane determined by the point of the needle and the two pivot points 33 should also contain the'axis of the needle 30.

It will be seen that the cross bar 32 lies against the cushion 36 and the pressure by which the pivot points 33 engage the sockets 40 is transmitted through the cushion 36 and the degree of this pressure may be adjusted by means of the set screw 38.

In Fig. 4, the vpoints-are carried by the stationary lug and the conical sockets arein the cross bar.

In Fig. 5 the points are carriedby the cr'oss bar 32 but are directed upwardly instead of horizontally and the abutment 35 with its sockets 40 is above.

In Fig. 6 there is simply 11 between the points and socke with Fig. 5. g In Fig. 7 the screw 38 `is made'to carry the pivot point 33 and the socket 40 is on the cross bar 32 as in Fig. 6. The form of the lever used in the device of Fig. 7 is shown in Fig. 8.

'In Fig. 9 the pivot point is directed upwardly instead of downwardly as in Fig. 7.

In Fig. 10 the pivot point carried by the scgw 38 is directed horizontally toward the le i In Fig. 11 the pivot point 33 carried by the screw 38 is directed horizontally toward the right.

In Fig. 12 I substitute the knife-edge 33', (see Fig. 14) for the points heretofore described. These knife-edges are interrupted s., compared on the opposite side thereof from the by the holes through the cross bar 32 to receive the screws 35. Under the heads of the screws 35 are Washers 42 with V-shaped channels 43 to aiord seats for the knifeedges 33.

It will be seen that in all these cases I provide a cushion adjacent the cross bar of the lever'and that the pivot members supporting this lever and cross bar are pressed together through the cushion. I have found as a result of inuchstudy and experiment that this device affords a decided improvement in the quality of the tone given by a phonograph reproducer.

In a sound box for sound reproducing machines, the combination with the frame of the box, of a stylus-supporting lever having a cross bar thereon, spaced parallel supporting members projecting from the peripherv of said frame between which said cross bar is located, one of said members and one side of said cross bar carrying respective elements of two pin and socket pivot oints, one pivot jointbeing located at each side of said lever, a cushion between the other of said members and the other side of said cross bar, and screws alining with,

FOREST CHENEY.

Vitnesses GEO. L. WILKrNsoX, HELEN FREUND. 

